Hello, Luca Cattoi.  This feature is already in our feature request list for a future major release.  I am changed this to under consideration.

Partial solution:

After further review with the dev. team, we recognize the value of this feature request.  Because of its complexity and current limitations of the underlying systems, it will require significant modification.  We will include it in a future major update, however.  I am changing the status to Planned.

This feature has been implemented in the SmarterMail 13 release.  It is available to system administrators.

Was it really necessary to obliterate the useful instructions at http://forums.smartertools.com/threads/howto-restore-mailbox-data-without-restarting-smartermail-service.23842/ ? Not everyone can upgrade to SM13 right away.

 

Fortunately google had it cached, and I now have it saved to my hard drive.